/Engine/Source/Runtime/AudioMixer/Public/AudioMixerBlueprintLibrary.h
Begin loading a sound into the cache so that it can be played immediately.
static void PrimeSoundForPlayback ( [USoundWave](API\Runtime\Engine\Sound\USoundWave) * SoundWave, const [FOnSoundLoadComplete](API\Runtime\AudioMixer\FOnSoundLoadComplete) OnLoadCompletion )